... , 460V, 796V, 60Hz 3) Design plan: design-B, C NEMA standard high efficiency motor NEMA standard high efficiency motors are totally enclosed fan ... designed and manufactured in accordance with NEMA standard of U.S. A and C390-93 standard of Canada. These motors are of ... ,low vibration,high starting torque,etc. The motors adopt design B and class F insulation. Their service factor is 1.15 ...